CVE-2026-57075
Description
YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via a signed-char lookup-table index in syck_base64dec.
The base64 decoder in the bundled libsyck indexes the 256-entry static table b64_xtable with a signed char, so any !!binary byte >= 0x80 sign-extends to a negative index and reads before the table. The decoder receives the raw bytes of any !!binary node, a standard YAML type not gated by $LoadBlessed or $LoadCode, so it is reached on the default Load path.
Any caller that runs Load or LoadFile on an untrusted document containing a !!binary scalar with a high-bit byte triggers the read, and the value read can surface in the decoded result.
Metadata
Severity & Metrics
No CVSS data available.
Affected products (1)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| TODDR | YAML::Syck | — | 0 < 1.47 |
Weakness (CWE)
| CWE | Source | Description |
|---|---|---|
| CWE-125 | cna | CWE-125 Out-of-bounds Read |
References (2)